For FS bar, one would only need a simple piece of ie aluminium (plastic?) shaped as a hook under the quick release depower lines. This can be added in no time with removing the lines. If you think about that, the plastic might actually slide over the 'oval' stainless steel QR end, and with a few holes, the lines can go through.

Than, because the FS bar has automatic untwisting of depower lines, the hook would be in exactly the same place after you untwist. Every time, all the time.

Guys if u want a microloop just create one yourself. I would think its pretty easy to do. If i remember there was a type of bar like this way back in the day when kiting was getting started.I dont think there is a wide demand for this now and offcourse the potential accidental risk is not worth it for any manufacturer as now u would have to release the chicken loop and somehow detach from the microloop also. its bad enough most people dont activate their chicken loop when danger strikes but just hold on for dare life instead or stare blankly while the kite drags them around. lol